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Step 6: Affix multi-storey double sticky tape paper on the 3# reflector ,move laser head to the nearest
position from 2# mirror, press pulse(choose suitable power),get a spot on the paper.
Step 7: Move away the laser head to the position farthest from the 2# mirror, press pulse(first to detect the
approximate location of laser with a piece of cardboard to prevent wounding),get another spot.